Answer:
He was 0.4781 s in air.
Step-by-step explanation:
This question is on an object launched horizontally with zero angle and at a height H.
The formula to apply is ;
![T=\sqrt{(2H)/(g) }](https://img.qammunity.org/2021/formulas/physics/college/6b7fb45gbuuond8x7bgx685ee020b9riqz.png)
where ;
T=time of flight = ?
H= height of the object was launched = 1.12 m
T= √2*1.12/9.8
T=√0.22857
T= 0.4781 seconds